I'd say it all depends on the rules he community of each game agrees on. For Noita this is not a legit run and that is fine, but using data from different runs/saves to make another run faster is not that unusual I think. Pretty sure some jRPGs do similar things for rng manipulation and Kotor2 and Skyrim have useful glitches that appear when you leave the game running for a while before starting your run. They are not allowed, but for skyrim at least the reasoning is not that it is an invalid strat, but that the setup is too much of a pain.